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3 years ago

Which statement is true about the graphs of the two lines y= -8x-5/4 and y= 1/8x+4/5?

Mathematics

1 answer:

deff fn [24]3 years ago

4 0

Answer:

The lines are perpendicular to each other because $-8$ and $\frac{1}{8}$ are opposite reciprocals of each other.

Step-by-step explanation:

The first line has equation $y=-8x-\frac{5}{4}$ .

The slope of this equation is $-8$ .

The second equation is $y=\frac{1}{8}x+\frac{4}{5}$

The slope of this equation is $\frac{1}{8}$

The two slopes are negative reciprocals of each other.

This means that the two lines are perpendicular.

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3 years ago

Read 2 more answers

If a = √3-√11 and b = 1 /a, then find a² - b²

Serga [27]

If $b=\frac1a$ , then by rationalizing the denominator we can rewrite

$b = \dfrac1{\sqrt3-\sqrt{11}} \times \dfrac{\sqrt3+\sqrt{11}}{\sqrt3+\sqrt{11}} = \dfrac{\sqrt3+\sqrt{11}}{\left(\sqrt3\right)^2-\left(\sqrt{11}\right)^2} = -\dfrac{\sqrt3+\sqrt{11}}8$

Now,

$a^2 - b^2 = (a-b) (a+b)$

and

$a - b = \sqrt3 - \sqrt{11} + \dfrac{\sqrt3 + \sqrt{11}}8 = \dfrac{9\sqrt3 - 7\sqrt{11}}8$

$a + b = \sqrt3 - \sqrt{11} - \dfrac{\sqrt3 + \sqrt{11}}8 = \dfrac{7\sqrt3 - 9\sqrt{11}}8$

$\implies a^2 - b^2 = \dfrac{\left(9\sqrt3 - 7\sqrt{11}\right) \left(7\sqrt3 - 9\sqrt{11}\right)}{64} = \boxed{\dfrac{441 - 65\sqrt{33}}{32}}$

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1 year ago